CVE-2026-68153 (GCVE-0-2026-68153)

Vulnerability from cvelistv5 – Published: 2026-08-10 11:59 – Updated: 2026-08-19 16:30
VLAI
Title
libceph: remove debugfs files before client teardown
Summary
In the Linux kernel, the following vulnerability has been resolved: libceph: remove debugfs files before client teardown ceph_destroy_client() tears down the monitor client before removing the per-client debugfs files. A concurrent read of the monmap debugfs file can enter monmap_show() after ceph_monc_stop() has freed monc->monmap, triggering a use-after-free. Remove the debugfs files before stopping the OSD and monitor clients. debugfs_remove() drains active handlers and prevents new accesses, so the debugfs callbacks can no longer race the rest of client teardown.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 76aa844d5b2fb8c839180d3f5874e333b297e5fd , < ac78549d186090ee7125d28c3a8c376573b36194 (git)
Affected: 76aa844d5b2fb8c839180d3f5874e333b297e5fd , < 463a264e9094384112a5c8b46f0a9ddaf8566904 (git)
Affected: 76aa844d5b2fb8c839180d3f5874e333b297e5fd , < fe46b7e06f14f6f94766832df309b249cb689d27 (git)
Affected: 76aa844d5b2fb8c839180d3f5874e333b297e5fd , < fc1010e7e0204ece6cc0f9af4f473e9553535eab (git)
Affected: 76aa844d5b2fb8c839180d3f5874e333b297e5fd , < d3dc8889d39a676bf840132bd5c5c48cb0daba23 (git)
Affected: 76aa844d5b2fb8c839180d3f5874e333b297e5fd , < 8f5a3abc54ba24dbceb14cc3a719908c4f688091 (git)
Affected: 76aa844d5b2fb8c839180d3f5874e333b297e5fd , < b9fedda2f628e030384228de0dafc574b7fb0c2f (git)
Affected: 76aa844d5b2fb8c839180d3f5874e333b297e5fd , < e4c804726c4afce3ba648b982d564f6af2cfa328 (git)
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Linux Linux Affected: 2.6.34
Unaffected: 0 , < 2.6.34 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: remove debugfs files before client teardown\n\nceph_destroy_client() tears down the monitor client before removing\nthe per-client debugfs files. A concurrent read of the monmap debugfs\nfile can enter monmap_show() after ceph_monc_stop() has freed\nmonc-\u003emonmap, triggering a use-after-free.\n\nRemove the debugfs files before stopping the OSD and monitor clients.\ndebugfs_remove() drains active handlers and prevents new accesses, so\nthe debugfs callbacks can no longer race the rest of client teardown."
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            "baseSeverity": "HIGH",
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            "version": "3.1"
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              "value": "AV:L - Exploitation requires local access to debugfs via read() on /sys/kernel/debug/ceph/client*/monmap concurrent with local ceph client teardown via umount or rbd unmap; the bug is not reachable through Ceph network protocol handlers.\nAC:L - The attacker controls both sides of the race by concurrently reading the monmap debugfs file while triggering ceph_destroy_client() via umount/rbd teardown, and can retry until the window between ceph_monc_stop() and debugfs removal is hit.\nPR:L - An unprivileged local user can use user-namespace capabilities (CAP_DAC_READ_SEARCH) to read root-owned debugfs files and race reads against libceph client teardown during automated volume detach or service restarts on Ceph storage nodes.\nUI:N - No victim user interaction is required; a local attacker can independently issue debugfs reads and trigger or time against client teardown without requiring another user to click, open files, or mount filesystems.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security domain and does not cross VM, container, or IOMMU boundaries; impact is standard kernel privilege escalation or crash.\nC:H - The use-after-free on monc-\u003emonmap permits reading freed heap memory containing monitor addresses and entity metadata, and UAF primitives are routinely leveraged for arbitrary kernel memory disclosure.\nI:H - Heap use-after-free on the variable-length ceph_monmap structure enables memory corruption that can be groomed into arbitrary kernel write primitives and local privilege escalation via control-flow hijacking.\nA:H - Concurrent access to freed monmap memory during debugfs iteration can cause kernel oops, BUG, or panic, and UAF corruption reliably threatens system availability even when full exploitation is not attempted."
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    "dateUpdated": "2026-08-19T16:30:18.048Z",
    "state": "PUBLISHED"
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A concurrent read of the monmap debugfs\\nfile can enter monmap_show() after ceph_monc_stop() has freed\\nmonc-\u003emonmap, triggering a use-after-free.\\n\\nRemove the debugfs files before stopping the OSD and monitor clients.\\ndebugfs_remove() drains active handlers and prevents new accesses, so\\nthe debugfs callbacks can no longer race the rest of client teardown.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ceph/ceph_common.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"76aa844d5b2fb8c839180d3f5874e333b297e5fd\",\"lessThan\":\"ac78549d186090ee7125d28c3a8c376573b36194\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"76aa844d5b2fb8c839180d3f5874e333b297e5fd\",\"lessThan\":\"463a264e9094384112a5c8b46f0a9ddaf8566904\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"76aa844d5b2fb8c839180d3f5874e333b297e5fd\",\"lessThan\":\"fe46b7e06f14f6f94766832df309b249cb689d27\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"76aa844d5b2fb8c839180d3f5874e333b297e5fd\",\"lessThan\":\"fc1010e7e0204ece6cc0f9af4f473e9553535eab\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"76aa844d5b2fb8c839180d3f5874e333b297e5fd\",\"lessThan\":\"d3dc8889d39a676bf840132bd5c5c48cb0daba23\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"76aa844d5b2fb8c839180d3f5874e333b297e5fd\",\"lessThan\":\"8f5a3abc54ba24dbceb14cc3a719908c4f688091\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"76aa844d5b2fb8c839180d3f5874e333b297e5fd\",\"lessThan\":\"b9fedda2f628e030384228de0dafc574b7fb0c2f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"76aa844d5b2fb8c839180d3f5874e333b297e5fd\",\"lessThan\":\"e4c804726c4afce3ba648b982d564f6af2cfa328\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ceph/ceph_common.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.34\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.34\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.148\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.101\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.42\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.6\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/463a264e9094384112a5c8b46f0a9ddaf8566904\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8f5a3abc54ba24dbceb14cc3a719908c4f688091\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ac78549d186090ee7125d28c3a8c376573b36194\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b9fedda2f628e030384228de0dafc574b7fb0c2f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d3dc8889d39a676bf840132bd5c5c48cb0daba23\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e4c804726c4afce3ba648b982d564f6af2cfa328\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fc1010e7e0204ece6cc0f9af4f473e9553535eab\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fe46b7e06f14f6f94766832df309b249cb689d27\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-13T23:17:25+00:00",
      "cve": "CVE-2026-68153",
      "id": "CVE-2026-68153",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: libceph: remove debugfs files before client teardown",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68153.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-17T16:29:42Z",
      "cve": "CVE-2026-68153",
      "id": "CVE-2026-68153",
      "initial_release_date": "2026-08-17T16:29:42Z",
      "product_status:known_affected": "296",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68153",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68153.json",
      "version": "2"
    }
  }
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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